<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            width: 500px;
            height: 240px;
            margin: 0 auto;
            border: 2px solid #999;
            border-radius: 5px;
        }
        
        .login_box {
            width: 400px;
            margin: 0 auto;
        }
        
        .login_box input {
            width: 400px;
            height: 30px;
            border-radius: 5px;
            margin-top: 20px;
            border: 1px solid #ccc;
            outline-color: blue;
        }
        
        .login_box button {
            width: 400px;
            height: 35px;
            background-color: orange;
            color: white;
            border: none;
            border-radius: 5px;
            margin-top: 20px;
        }
    </style>
</head>

<body>
    <div class="box">
        <div class="login_box">
            <input type="text" placeholder="用户">
            <input type="password" placeholder="密码">
            <input type="mail" placeholder="邮箱">
            <button>Login</button>
        </div>

    </div>
</body>

</html>